Landscape Architect & Specifier News

JUN 2018

LASN is a photographically oriented, professional journal featuring topics of concern and state-of-the-art projects designed or influenced by registered Landscape Architects.

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76 Landscape Architect and Specifier News I n f o r m a t i o n R e q u e s t # 5 0 0 The most prominent enemy of honeybees is the varroa mite. This external parasite is highly reproductive and can cause devastation to honeybee colonies in a large area. 2017-2018 Honey Bee Colony Report The Bee Informed Partnership completed its 12th annual survey of managed bee colony loss experienced in the U.S., and its territories, between April 1, 2017 and April 1, 2018. Approximately 4,794 beekeepers of varying sizes, who manage about 176,000 colonies, responded to the survey. The U.S. Department of Agriculture estimates that this amount represents 6.6% of the nation's 2.67 million managed honeybee colonies. During the winter months approximately 30.7% of managed colonies in the U.S. were lost, an increase of 9.5% over the previous year (21.2%). Respondents reported 17.1% of their colonies were lost during the summer, months, whereas 18.2% of colonies were reported lost during the previous year. For the entire survey period (April 1, 2017 - April 1, 2018), beekeepers lost an estimated 40.1% of their managed honeybee colonies. This amount is up about 7% from the previous year, but on par with most other years since 2010. One notable trend highlighted by the survey is that the self-reported "level of acceptable winter colony loss" has increased to almost 21%, the highest it has ever been. This shows that beekeepers are more likely to expect higher rates of colony termination. Although there is a slight discrepancy because the data shows that 69% of all responders lost more of their colonies than they had deemed acceptable. To find out more about this year's honeybee colony losses, visit the Bee Informed webpage https://beeinformed. org/results/honey-bee-colony-losses-2017- 2018-preliminary-results/ .The organization is also planning on releasing their first ever 10-year summary on bee colony loss in the coming months. The Wonderful World of Plants PHOTO: CREATIVE COMMONS ATTRIBUTION-SHARE ALIKE 3.0 UNPORTED Flowers entice pollinators with bright colors, shapes, patterns, fragrances and even temperatures in some cases. Yes, yes, we know that! Well, not about the temperatures, but the rest, yes! But did you know that bumblebees also find their way to nectar by detecting the stronger electrostatic field produced by flowers with abundant nectar supplies? Flowers low on nectar apparently do want to advertise their diminished supply to the bumblebees, only their surplus. The bumblebees detect the electrostatic field through their hair follicles. The bumblebees themselves emit a low-level positive electrostatic field. Unlike humans, bumblebees and honeybees, and every flying pollinator of comparable size, can sense electrical fields.

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